This particular batch of B. liniflora were grown in shallow, plastic trays, in swamp-like conditions (peat, sand, live LFS). Shallow isn't a good idea, though, not with olants that have developed root sytems. Nonetheless, it worked for me.
The bottom pic is that of D. sessilifolia, very similar in apearance to that of D. burmannii - but only one germinated.
It was that particular hanging basket that cracked, that crashed into the two swamp trays, causing the disaster.